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unusual base?

I have come across this base before, but don't know how the item was produced.
It doesn't look like a pontil, it seems to be kind of swirled. This happens to be the base of a decanter.
Any insight? The items maybe from the 1920's

It's not a pontil scar. The blowpipe was inserted into the batch of glass, rotated, withdrawn and snipped, or rotated until the gather separated from the batch. In this case, the gather had just enough time to stiffen ever so slightly on the way to being inserted into the mold and that, coupled with the center of the base being the point where the gather is expanded the least as it was blown into the mold, resultied in a bit of a swirl left by rotating the blowpipe. It's hard to describe so I hope all this makes some sense.

I have come across this base before, but don't know how the item was produced.
It doesn't look like a pontil, it seems to be kind of swirled. This happens to be the base of a decanter.
Any insight? The items maybe from the 1920's

I have a ponytail from hell can't find the dam bottles use anywhere it's small líke a big lab testube but the pintails at least 2 inches deep nice dark as heck green no.markings at all but pintails deepest I've ever seen no idea what bot was used for?

Sandchip, Thanks for the explanation. Yes, that does make sense. I wasn't sure if it was B-I-M, since the side seams go up & onto the bottom of the flare of the lip.
Etching is 'KUMMEL', a german liquor with anise & carraway seed flavor. I've never had it & don't think I'ld like it.